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Economic Analysis of Water Supply and Water Quality Benefits

This proposal analyzes costs, benefits, and economic impacts of water supply enhancement with a focus on water quality improvements. It includes detailed cost breakdowns, quantitative physical and economic benefit estimates, and planning horizon analysis. The document describes how the proposal would generate value, outlines cost savings, and emphasizes the importance of accurate benefit estimation. Benefits and cost savings tables are provided to aid in planning horizon analysis. The text also addresses water quality standards, beneficial uses, and economic quantification related to water quality benefits.

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Economic Analysis of Water Supply and Water Quality Benefits

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  1. Economic Analysis of Water Supply and Water Quality Benefits IRWM Round 2 Roger Mann Lorraine Marsh Steve Hatchett Jerry Horner

  2. Each Proposal Must Include • Cost details for the entire Proposal • Description of the Proposal’s water supply and water quality benefits by reference to a future without the Proposal • Quantified estimates of physical benefits, if possible • Economic benefits analysis, if possible

  3. Required Economic Assumptions • Must evaluate as a stand-alone proposal • Include all associated costs • Not just grant-funded portion • Benefit-Cost Assumptions • Use 50-year analysis period, unless justification provided. • Use 6 percent to discount future costs, benefits • Show all costs and benefits in year 2006 dollars • Real costs or benefits can trend over time • Planning horizon analysis if appropriate

  4. Why Use Planning Horizon Annual Analysis? • Tables are provided for Planning Horizon Annual Analysis • Average annual values could be used if: • Over planning horizon, expected benefits are fairly uniform or random variation due to hydrology (no trend), AND • O&M and replacement costs are fairly uniform or random, AND • All capital costs incurred up front (not staged) • Then, for a 50-year project, NPV of annual benefits and O&M costs is 15.76 times the annual value • Planning horizon annual analysis is appropriate if capital costs are staged, or if there is a significant trend in benefits or O&M costs over project life

  5. Costs to include • All costs must be included regardless of who pays • All capital, O&M, and future replacement • Economic costs include opportunity costs of any resources (land, volunteer labor) committed to the project even if they were purchased in the past • Opportunity cost is the market value of the resource now

  6. Benefits and Cost Savings • Economic benefits are 1) the value of water quality or quantity improvements or 2) cost savings, both relative to without-proposal • Count 1) when • Without proposal, no other project would be implemented • Benefits are achieved only with the proposal • The effect of the proposal is to achieve a physical quality or supply benefit that would not otherwise be obtained • Count 2) cost savings when: • Without proposal, some other project would be implemented instead • Benefits are achieved with either proposal or project • The effect of the proposal is to avoid a cost

  7. Benefits Hints • For water supply, usually cost savings. If there is no supply alternative, might claim reduced shortage cost • Economic impacts such as jobs or income created in construction are not benefits • Do not double count • Count only one type of benefit or cost savings for each unit of water supply produced • Can count different types for different conditions • Hydrologic conditions: wet year, reduce purchases, dry year, reduce shortage • Planning horizon: short run, improve quality, long-run, avoid a future project

  8. Documenting Cost Savings and Benefits • Describe what would happen (especially costs) in the future without the proposal • Describe how proposal will be operated to obtain benefits claimed • Document benefits thoroughly, including future conditions without and with the proposal • Past supply planning documents, Board minutes, land use plans • Make any past documentation of physical or economic benefits analysis available

  9. Benefits/Cost Savings Tables for Planning Horizon Analysis • Unit benefit (Table 12) • Water sales revenues, only if real supply increase, • Avoided water supply purchases, or • Benefit or cost savings per unit salinity • Cost of future projects avoided (Table 13) • water supply project • water quality project • Other (Table 14) • secondary studies NOTE: Benefit estimates must realistically reflect what the agency would actually do in absence of proposal

  10. Water Quality Benefits • Link Project Hydrology to Receiving Water Body

  11. Identify Water Quality Standards • http://www.waterboards.ca.gov/ • Regional Board • Water Quality Control Plan (Basin Plan) • Basin Plan Documents • Section 3. Water Quality Objectives (standards)

  12. Estimate • Change in Flow • Reduction in Concentration • Reduction In Loading • Units Per Time Period (X tons of sediment per day)

  13. Water Quality Economic Quantification • Basin Plan Beneficial Uses (Section 2) • State Water Resources Control Board Uniform List of Beneficial Uses (1996) • Water Supply • MUN Municipal and Domestic Supply • AGR Agricultural Supply • IND Industrial Service Supply • PRO Industrial Process Supply • GWR Groundwater Recharge • FRSH Freshwater Replenishment • NAV Navigation • POW Hydropower Generation

  14. Recreation • REC-1 Water Contact Recreation • REC-2 Non-Contact Water Recreation • Habitat • Comm Commercial and Sport Fishing • WARM Warm Freshwater Habitat • COLD Cold Freshwater Habitat • ASBS Preservation of Areas of Special Biological Significance • SAL Inland Saline Water Habitat • WILD Wildlife Habitat • RARE Rare, Threatened, or Endangered Species • MAR Marine Habitat • MIGR Migration of Aquatic Organisms • SPWN Spawning, Reproduction, and/or Early Development • SHELL Shellfish Harvesting • EST Estuarine Habitat • AQUA Aquaculture

  15. North Coast Region Beneficial Use Designations • Wetland • WET Wetland Habitat • WQE Water Quality Enhancement • FLD Flood Peak Attenuation/ Flood Water Storage • Traditional and Cultural Uses of Water • CUL Native American Culture • FISH Subsistence Fishing

  16. Non-Market Values (Habitat, Recreation, etc.) • National Ocean Economics Program • Non-Market Valuation Studies Database • http://noep.mbari.org/nonmarket/NMsearch.asp • Beneficial Use Value Calculator Database (BUVC) • Over 3,000 Non-Market Values • Sorted by Beneficial Use

  17. Scoring • The minimum score is 1 point. • The remaining 4 points scored based on two criteria: • NET economic benefits • Quality of the economic analysis and documentation • Unsubstantiated, deceptive, poor quality, or poorly documented economic analysis can result in the score being reduced. • Exceptional documentation can increase score.

  18. Other Expected Benefits • Types could include: • Ecosystem Restoration • Flood Control • Recreation and Public Access • Power Cost Savings or Power Production • Other Environmental Benefits • Same economic principles apply

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